If in a ABC, ^4A+ ^4B+ ^4C= ^2B ^2C+2 ^2C ^2A+2 ^2A ^2B, then A=

JEE Main Mathematics question

Not in JEE syllabus

If in a , , then

Answer: (A)

Convert to sides by multiplying through by : . Rearranged, this is

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Question ID VK-008459